Pronouns are the words tht replace nouns. In English language, pronouns only take the gender of the noun they replace in the 3rd person singular form. The 2nd person plural pronouns are identical to the 2nd person singular pronouns except for the reflexive pronoun.

Here is a table showing all pronouns;

► Subject Pronouns

Subject pronouns replace nouns that are the subject of their clause. In the 3rd person, subject pronouns are often used to not to repeat the subject's name.

Examples:

I am 34 years old.
You look very tired today.
John is a very handsome man. He always wears chick clothes. 
This cat is so sweet. It is also very playful.
We are late. Let's hurry up. 

► Object Pronouns

Object pronouns are used to replace nouns that are the direct or indirect object of a clause.

Examples;

Give the pen to me.
My dad wanted to talk to us.
I love him very much. 
I got an e-mail from her last night. 
I can't forgive them. 

► Possesive Adjectives (Determiners)

Possessive adjectives are not pronouns but it's a good idea to learn them with pronouns. Because they are similar in form to possessive pronouns. Possessive adjectives are determiners and they function as adjectives. They are used before the noun they modify in the sentence. They do not replace nouns. 

Examples;

Have you found your passport?
I want to clean my house today.
Tom broke his leg yesterday. 
Kids brought their projects to the classroom. 
What is her name?

► Possesive Pronouns

Possessive pronouns are used in English to avoid repeating information that is already clear. In always makes the sentence more clear because the same information is not repeated.

Examples;

This book is mine.
I found my bag. Where is yours?
Our room is always tidy but theirs is in a mess. 
That car looks like hers. 

► Reflexive (Intensive) Pronouns

- We use reflexive pronouns when the subject and the object refer to the same person or thing.

He cut himself while he was doing the project.
She bought herself a present a pair of trousers.
They helped themselves at the party.
Be careful and don't injure yourselves.
I enjoyed myself at the party very much.
 

- We use reflexive pronouns for emphasis.

The teacher talked to me herself!
I finished the project myself. I didn't get help from anybody. 
You should clean your room yourself. 

- We use reflexive pronouns with a similar meaning to "also" or "too"

My sister was very angry last night. I was pretty angry myself. 

- We DON'T use reflexive pronouns with a number of verbs. It's confusing because in some other languages, those verbs can be used with reflexive pronouns. 

Those verbs are, adapt, complain, concentrate, get up, hide, lie down, meet, move, relax, remember, shave, shower, sit down.

- We DON'T use reflexive pronouns after a preposition of place or location we use a personal pronoun and not a reflexive pronoun.

He put the luggage next to him. (himself)

- We use verb + reflexive pronoun + object when we do something for ourselves.

He made himself a big cake.
They taught themselves English. 

- We use verb + object + reflexive pronoun when we want to emphasize that another person did not do the action.

I painted the room myself.
They finished the homework themselves.
You should talk to your boss yourself. 

- By + Reflexive Pronouns

We use by + myself/yourself/himself etc when we are alone or not get assistant or help.

Can you go to the school by yourself?
Why are you sitting by yourself? Aren't you bored?
Kids should clean their rooms by themselves.